Equivalent of iOS NSNotificationCenter in Android?
android, ios, iphone
Solution
In Android there is not a central notification center as in ios. But you can basically use Observable and Observer objects to achieve your task.
You can define a class like something below, just modify it for singleton use and add synchronized for concurrent use but the idea is the same:
public class ObservingService {
HashMap<String, Observable> observables;
public ObservingService() {
observables = new HashMap<String, Observable>();
}
public void addObserver(String notification, Observer observer) {
Observable observable = observables.get(notification);
if (observable==null) {
observable = new Observable();
observables.put(notification, observable);
}
observable.addObserver(observer);
}
public void removeObserver(String notification, Observer observer) {
Observable observable = observables.get(notification);
if (observable!=null) {
observable.deleteObserver(observer);
}
}
public void postNotification(String notification, Object object) {
Observable observable = observables.get(notification);
if (observable!=null) {
observable.setChanged();
observable.notifyObservers(object);
}
}
}
Problem
Is there an equivalent of the iOS class NSNotificationCenter in Android ? Are there any libraries or useful code available to me ?